Theophylact of Ohrid

Here is another consolation as well, since the Thessalonians were to be partakers in the crowns together with Paul, who had attained such perfection. By "the appearing of the Lord" he means His second coming, comforting them with this also. For, he says, now He is hidden, but do not lose heart. He shall be revealed as God and Lord. "From heaven," which is the throne of God. "With the angels of His power" (μετ αγγέλων φοβερών), because the angels are powers, that is, they are mighty. …

Commentary on 2 Thessalonians ↗

Cosmas Indicopleustes

At the revelation of the Lord Jesus, from heaven, with the angels of his power, in flaming fire, rendering vengeance to them that know not God, and to them that obey not the Gospel of our Lord Jesus Christ, who shall suffer punishment, even eternal destruction from the face of the Lord and from the glory of his might, when he shall come to be glorified in his saints, and to be marvelled at in all them that believed.

The Christian Topography, Book 5 ↗

Thomas Aquinas

"And to you who are troubled, rest." "You received good things in your life, and Lazarus likewise evil things. But now he is consoled while you suffer" (Luke 16:25). "Blessed are those who die in the Lord from henceforth now, says the Spirit, that they may rest from their labors" (Rev 14:13). "With us," i.e., in equal glory. But surely this is not true? I respond that there are two kinds of equality, namely the equality of absolute quantity and the equality of proportion. …

Commentary on 2 Thessalonians ↗